[deliverable/linux.git] / fs / nfsd / nfsctl.c

/*
 * linux/fs/nfsd/nfsctl.c
 *
 * Syscall interface to knfsd.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/module.h>

#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/smp_lock.h>

#include <linux/nfs.h>
#include <linux/nfsd_idmap.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
#include <linux/nfsd/interface.h>

#include <asm/uaccess.h>

/*
 *	We have a single directory with 9 nodes in it.
 */
enum {
	NFSD_Root = 1,
	NFSD_Svc,
	NFSD_Add,
	NFSD_Del,
	NFSD_Export,
	NFSD_Unexport,
	NFSD_Getfd,
	NFSD_Getfs,
	NFSD_List,
	NFSD_Fh,
	NFSD_Threads,
	NFSD_Versions,
	NFSD_Ports,
	/*
	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
	 */
#ifdef CONFIG_NFSD_V4
	NFSD_Leasetime,
	NFSD_RecoveryDir,
#endif
};

/*
 * write() for these nodes.
 */
static ssize_t write_svc(struct file *file, char *buf, size_t size);
static ssize_t write_add(struct file *file, char *buf, size_t size);
static ssize_t write_del(struct file *file, char *buf, size_t size);
static ssize_t write_export(struct file *file, char *buf, size_t size);
static ssize_t write_unexport(struct file *file, char *buf, size_t size);
static ssize_t write_getfd(struct file *file, char *buf, size_t size);
static ssize_t write_getfs(struct file *file, char *buf, size_t size);
static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
static ssize_t write_threads(struct file *file, char *buf, size_t size);
static ssize_t write_versions(struct file *file, char *buf, size_t size);
static ssize_t write_ports(struct file *file, char *buf, size_t size);
#ifdef CONFIG_NFSD_V4
static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
#endif

static ssize_t (*write_op[])(struct file *, char *, size_t) = {
	[NFSD_Svc] = write_svc,
	[NFSD_Add] = write_add,
	[NFSD_Del] = write_del,
	[NFSD_Export] = write_export,
	[NFSD_Unexport] = write_unexport,
	[NFSD_Getfd] = write_getfd,
	[NFSD_Getfs] = write_getfs,
	[NFSD_Fh] = write_filehandle,
	[NFSD_Threads] = write_threads,
	[NFSD_Versions] = write_versions,
	[NFSD_Ports] = write_ports,
#ifdef CONFIG_NFSD_V4
	[NFSD_Leasetime] = write_leasetime,
	[NFSD_RecoveryDir] = write_recoverydir,
#endif
};

static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
{
	ino_t ino =  file->f_dentry->d_inode->i_ino;
	char *data;
	ssize_t rv;

	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
		return -EINVAL;

	data = simple_transaction_get(file, buf, size);
	if (IS_ERR(data))
		return PTR_ERR(data);

	rv =  write_op[ino](file, data, size);
	if (rv>0) {
		simple_transaction_set(file, rv);
		rv = size;
	}
	return rv;
}

static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
{
	if (! file->private_data) {
		/* An attempt to read a transaction file without writing
		 * causes a 0-byte write so that the file can return
		 * state information
		 */
		ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
		if (rv < 0)
			return rv;
	}
	return simple_transaction_read(file, buf, size, pos);
}

static const struct file_operations transaction_ops = {
	.write		= nfsctl_transaction_write,
	.read		= nfsctl_transaction_read,
	.release	= simple_transaction_release,
};

extern struct seq_operations nfs_exports_op;
static int exports_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &nfs_exports_op);
}

static const struct file_operations exports_operations = {
	.open		= exports_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

/*----------------------------------------------------------------------------*/
/*
 * payload - write methods
 * If the method has a response, the response should be put in buf,
 * and the length returned.  Otherwise return 0 or and -error.
 */

static ssize_t write_svc(struct file *file, char *buf, size_t size)
{
	struct nfsctl_svc *data;
	if (size < sizeof(*data))
		return -EINVAL;
	data = (struct nfsctl_svc*) buf;
	return nfsd_svc(data->svc_port, data->svc_nthreads);
}

static ssize_t write_add(struct file *file, char *buf, size_t size)
{
	struct nfsctl_client *data;
	if (size < sizeof(*data))
		return -EINVAL;
	data = (struct nfsctl_client *)buf;
	return exp_addclient(data);
}

static ssize_t write_del(struct file *file, char *buf, size_t size)
{
	struct nfsctl_client *data;
	if (size < sizeof(*data))
		return -EINVAL;
	data = (struct nfsctl_client *)buf;
	return exp_delclient(data);
}

static ssize_t write_export(struct file *file, char *buf, size_t size)
{
	struct nfsctl_export *data;
	if (size < sizeof(*data))
		return -EINVAL;
	data = (struct nfsctl_export*)buf;
	return exp_export(data);
}

static ssize_t write_unexport(struct file *file, char *buf, size_t size)
{
	struct nfsctl_export *data;

	if (size < sizeof(*data))
		return -EINVAL;
	data = (struct nfsctl_export*)buf;
	return exp_unexport(data);
}

static ssize_t write_getfs(struct file *file, char *buf, size_t size)
{
	struct nfsctl_fsparm *data;
	struct sockaddr_in *sin;
	struct auth_domain *clp;
	int err = 0;
	struct knfsd_fh *res;

	if (size < sizeof(*data))
		return -EINVAL;
	data = (struct nfsctl_fsparm*)buf;
	err = -EPROTONOSUPPORT;
	if (data->gd_addr.sa_family != AF_INET)
		goto out;
	sin = (struct sockaddr_in *)&data->gd_addr;
	if (data->gd_maxlen > NFS3_FHSIZE)
		data->gd_maxlen = NFS3_FHSIZE;

	res = (struct knfsd_fh*)buf;

	exp_readlock();
	if (!(clp = auth_unix_lookup(sin->sin_addr)))
		err = -EPERM;
	else {
		err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
		auth_domain_put(clp);
	}
	exp_readunlock();
	if (err == 0)
		err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
 out:
	return err;
}

static ssize_t write_getfd(struct file *file, char *buf, size_t size)
{
	struct nfsctl_fdparm *data;
	struct sockaddr_in *sin;
	struct auth_domain *clp;
	int err = 0;
	struct knfsd_fh fh;
	char *res;

	if (size < sizeof(*data))
		return -EINVAL;
	data = (struct nfsctl_fdparm*)buf;
	err = -EPROTONOSUPPORT;
	if (data->gd_addr.sa_family != AF_INET)
		goto out;
	err = -EINVAL;
	if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
		goto out;

	res = buf;
	sin = (struct sockaddr_in *)&data->gd_addr;
	exp_readlock();
	if (!(clp = auth_unix_lookup(sin->sin_addr)))
		err = -EPERM;
	else {
		err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
		auth_domain_put(clp);
	}
	exp_readunlock();

	if (err == 0) {
		memset(res,0, NFS_FHSIZE);
		memcpy(res, &fh.fh_base, fh.fh_size);
		err = NFS_FHSIZE;
	}
 out:
	return err;
}

static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
	/* request is:
	 *   domain path maxsize
	 * response is
	 *   filehandle
	 *
	 * qword quoting is used, so filehandle will be \x....
	 */
	char *dname, *path;
	int maxsize;
	char *mesg = buf;
	int len;
	struct auth_domain *dom;
	struct knfsd_fh fh;

	if (buf[size-1] != '\n')
		return -EINVAL;
	buf[size-1] = 0;

	dname = mesg;
	len = qword_get(&mesg, dname, size);
	if (len <= 0) return -EINVAL;
	
	path = dname+len+1;
	len = qword_get(&mesg, path, size);
	if (len <= 0) return -EINVAL;

	len = get_int(&mesg, &maxsize);
	if (len)
		return len;

	if (maxsize < NFS_FHSIZE)
		return -EINVAL;
	if (maxsize > NFS3_FHSIZE)
		maxsize = NFS3_FHSIZE;

	if (qword_get(&mesg, mesg, size)>0)
		return -EINVAL;

	/* we have all the words, they are in buf.. */
	dom = unix_domain_find(dname);
	if (!dom)
		return -ENOMEM;

	len = exp_rootfh(dom, path, &fh,  maxsize);
	auth_domain_put(dom);
	if (len)
		return len;
	
	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
	mesg[-1] = '\n';
	return mesg - buf;	
}

extern int nfsd_nrthreads(void);

static ssize_t write_threads(struct file *file, char *buf, size_t size)
{
	/* if size > 0, look for a number of threads and call nfsd_svc
	 * then write out number of threads as reply
	 */
	char *mesg = buf;
	int rv;
	if (size > 0) {
		int newthreads;
		rv = get_int(&mesg, &newthreads);
		if (rv)
			return rv;
		if (newthreads <0)
			return -EINVAL;
		rv = nfsd_svc(2049, newthreads);
		if (rv)
			return rv;
	}
	sprintf(buf, "%d\n", nfsd_nrthreads());
	return strlen(buf);
}

static ssize_t write_versions(struct file *file, char *buf, size_t size)
{
	/*
	 * Format:
	 *   [-/+]vers [-/+]vers ...
	 */
	char *mesg = buf;
	char *vers, sign;
	int len, num;
	ssize_t tlen = 0;
	char *sep;

	if (size>0) {
		if (nfsd_serv)
			/* Cannot change versions without updating
			 * nfsd_serv->sv_xdrsize, and reallocing
			 * rq_argp and rq_resp
			 */
			return -EBUSY;
		if (buf[size-1] != '\n')
			return -EINVAL;
		buf[size-1] = 0;

		vers = mesg;
		len = qword_get(&mesg, vers, size);
		if (len <= 0) return -EINVAL;
		do {
			sign = *vers;
			if (sign == '+' || sign == '-')
				num = simple_strtol((vers+1), NULL, 0);
			else
				num = simple_strtol(vers, NULL, 0);
			switch(num) {
			case 2:
			case 3:
			case 4:
				nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
				break;
			default:
				return -EINVAL;
			}
			vers += len + 1;
			tlen += len;
		} while ((len = qword_get(&mesg, vers, size)) > 0);
		/* If all get turned off, turn them back on, as
		 * having no versions is BAD
		 */
		nfsd_reset_versions();
	}
	/* Now write current state into reply buffer */
	len = 0;
	sep = "";
	for (num=2 ; num <= 4 ; num++)
		if (nfsd_vers(num, NFSD_AVAIL)) {
			len += sprintf(buf+len, "%s%c%d", sep,
				       nfsd_vers(num, NFSD_TEST)?'+':'-',
				       num);
			sep = " ";
		}
	len += sprintf(buf+len, "\n");
	return len;
}

static ssize_t write_ports(struct file *file, char *buf, size_t size)
{
	/* for now, ignore what was written and just
	 * return known ports
	 * AF proto address port
	 */
	int len = 0;
	lock_kernel();
	if (nfsd_serv)
		len = svc_sock_names(buf, nfsd_serv);
	unlock_kernel();
	return len;
}

#ifdef CONFIG_NFSD_V4
extern time_t nfs4_leasetime(void);

static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
{
	/* if size > 10 seconds, call
	 * nfs4_reset_lease() then write out the new lease (seconds) as reply
	 */
	char *mesg = buf;
	int rv;

	if (size > 0) {
		int lease;
		rv = get_int(&mesg, &lease);
		if (rv)
			return rv;
		if (lease < 10 || lease > 3600)
			return -EINVAL;
		nfs4_reset_lease(lease);
	}
	sprintf(buf, "%ld\n", nfs4_lease_time());
	return strlen(buf);
}

static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
{
	char *mesg = buf;
	char *recdir;
	int len, status;

	if (size > PATH_MAX || buf[size-1] != '\n')
		return -EINVAL;
	buf[size-1] = 0;

	recdir = mesg;
	len = qword_get(&mesg, recdir, size);
	if (len <= 0)
		return -EINVAL;

	status = nfs4_reset_recoverydir(recdir);
	return strlen(buf);
}
#endif

/*----------------------------------------------------------------------------*/
/*
 *	populating the filesystem.
 */

static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
{
	static struct tree_descr nfsd_files[] = {
		[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
		[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
		[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
		[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
		[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
		[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
		[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
		[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
		[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
		[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
		[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
		[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
#ifdef CONFIG_NFSD_V4
		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
#endif
		/* last one */ {""}
	};
	return simple_fill_super(sb, 0x6e667364, nfsd_files);
}

static int nfsd_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
}

static struct file_system_type nfsd_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "nfsd",
	.get_sb		= nfsd_get_sb,
	.kill_sb	= kill_litter_super,
};

static int __init init_nfsd(void)
{
	int retval;
	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");

	nfsd_stat_init();	/* Statistics */
	nfsd_cache_init();	/* RPC reply cache */
	nfsd_export_init();	/* Exports table */
	nfsd_lockd_init();	/* lockd->nfsd callbacks */
	nfs4_state_init();	/* NFSv4 locking state */
	nfsd_idmap_init();      /* Name to ID mapping */
	if (proc_mkdir("fs/nfs", NULL)) {
		struct proc_dir_entry *entry;
		entry = create_proc_entry("fs/nfs/exports", 0, NULL);
		if (entry)
			entry->proc_fops =  &exports_operations;
	}
	retval = register_filesystem(&nfsd_fs_type);
	if (retval) {
		nfsd_export_shutdown();
		nfsd_cache_shutdown();
		remove_proc_entry("fs/nfs/exports", NULL);
		remove_proc_entry("fs/nfs", NULL);
		nfsd_stat_shutdown();
		nfsd_lockd_shutdown();
	}
	return retval;
}

static void __exit exit_nfsd(void)
{
	nfsd_export_shutdown();
	nfsd_cache_shutdown();
	remove_proc_entry("fs/nfs/exports", NULL);
	remove_proc_entry("fs/nfs", NULL);
	nfsd_stat_shutdown();
	nfsd_lockd_shutdown();
	nfsd_idmap_shutdown();
	unregister_filesystem(&nfsd_fs_type);
}

MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
module_init(init_nfsd)
module_exit(exit_nfsd)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfsd/nfsctl.c
	3	*
	4	* Syscall interface to knfsd.
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
1da177e4 LT	9	#include <linux/module.h>
	10
	11	#include <linux/linkage.h>
	12	#include <linux/time.h>
	13	#include <linux/errno.h>
	14	#include <linux/fs.h>
	15	#include <linux/fcntl.h>
	16	#include <linux/net.h>
	17	#include <linux/in.h>
	18	#include <linux/syscalls.h>
	19	#include <linux/unistd.h>
	20	#include <linux/slab.h>
	21	#include <linux/proc_fs.h>
	22	#include <linux/seq_file.h>
	23	#include <linux/pagemap.h>
	24	#include <linux/init.h>
70c3b76c	25	#include <linux/string.h>
80212d59	26	#include <linux/smp_lock.h>
1da177e4 LT	27
	28	#include <linux/nfs.h>
	29	#include <linux/nfsd_idmap.h>
	30	#include <linux/sunrpc/svc.h>
80212d59	31	#include <linux/sunrpc/svcsock.h>
1da177e4 LT	32	#include <linux/nfsd/nfsd.h>
	33	#include <linux/nfsd/cache.h>
	34	#include <linux/nfsd/xdr.h>
	35	#include <linux/nfsd/syscall.h>
	36	#include <linux/nfsd/interface.h>
	37
	38	#include <asm/uaccess.h>
	39
	40	/*
	41	* We have a single directory with 9 nodes in it.
	42	*/
	43	enum {
	44	NFSD_Root = 1,
	45	NFSD_Svc,
	46	NFSD_Add,
	47	NFSD_Del,
	48	NFSD_Export,
	49	NFSD_Unexport,
	50	NFSD_Getfd,
	51	NFSD_Getfs,
	52	NFSD_List,
	53	NFSD_Fh,
	54	NFSD_Threads,
70c3b76c	55	NFSD_Versions,
80212d59	56	NFSD_Ports,
70c3b76c N	57	/*
	58	* The below MUST come last. Otherwise we leave a hole in nfsd_files[]
	59	* with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
	60	*/
	61	#ifdef CONFIG_NFSD_V4
1da177e4	62	NFSD_Leasetime,
0964a3d3	63	NFSD_RecoveryDir,
70c3b76c	64	#endif
1da177e4 LT	65	};
	66
	67	/*
	68	* write() for these nodes.
	69	*/
	70	static ssize_t write_svc(struct file file, char buf, size_t size);
	71	static ssize_t write_add(struct file file, char buf, size_t size);
	72	static ssize_t write_del(struct file file, char buf, size_t size);
	73	static ssize_t write_export(struct file file, char buf, size_t size);
	74	static ssize_t write_unexport(struct file file, char buf, size_t size);
	75	static ssize_t write_getfd(struct file file, char buf, size_t size);
	76	static ssize_t write_getfs(struct file file, char buf, size_t size);
	77	static ssize_t write_filehandle(struct file file, char buf, size_t size);
	78	static ssize_t write_threads(struct file file, char buf, size_t size);
70c3b76c	79	static ssize_t write_versions(struct file file, char buf, size_t size);
80212d59	80	static ssize_t write_ports(struct file file, char buf, size_t size);
70c3b76c	81	#ifdef CONFIG_NFSD_V4
1da177e4	82	static ssize_t write_leasetime(struct file file, char buf, size_t size);
0964a3d3	83	static ssize_t write_recoverydir(struct file file, char buf, size_t size);
70c3b76c	84	#endif
1da177e4 LT	85
	86	static ssize_t (write_op[])(struct file , char *, size_t) = {
	87	[NFSD_Svc] = write_svc,
	88	[NFSD_Add] = write_add,
	89	[NFSD_Del] = write_del,
	90	[NFSD_Export] = write_export,
	91	[NFSD_Unexport] = write_unexport,
	92	[NFSD_Getfd] = write_getfd,
	93	[NFSD_Getfs] = write_getfs,
	94	[NFSD_Fh] = write_filehandle,
	95	[NFSD_Threads] = write_threads,
70c3b76c	96	[NFSD_Versions] = write_versions,
80212d59	97	[NFSD_Ports] = write_ports,
70c3b76c	98	#ifdef CONFIG_NFSD_V4
1da177e4	99	[NFSD_Leasetime] = write_leasetime,
0964a3d3	100	[NFSD_RecoveryDir] = write_recoverydir,
70c3b76c	101	#endif
1da177e4 LT	102	};
	103
	104	static ssize_t nfsctl_transaction_write(struct file file, const char __user buf, size_t size, loff_t *pos)
	105	{
	106	ino_t ino = file->f_dentry->d_inode->i_ino;
	107	char *data;
	108	ssize_t rv;
	109
e8c96f8c	110	if (ino >= ARRAY_SIZE(write_op) \|\| !write_op[ino])
1da177e4 LT	111	return -EINVAL;
	112
	113	data = simple_transaction_get(file, buf, size);
	114	if (IS_ERR(data))
	115	return PTR_ERR(data);
	116
	117	rv = write_op[ino](file, data, size);
	118	if (rv>0) {
	119	simple_transaction_set(file, rv);
	120	rv = size;
	121	}
	122	return rv;
	123	}
	124
7390022d N	125	static ssize_t nfsctl_transaction_read(struct file file, char __user buf, size_t size, loff_t *pos)
	126	{
	127	if (! file->private_data) {
	128	/* An attempt to read a transaction file without writing
	129	* causes a 0-byte write so that the file can return
	130	* state information
	131	*/
	132	ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
	133	if (rv < 0)
	134	return rv;
	135	}
	136	return simple_transaction_read(file, buf, size, pos);
	137	}
	138
4b6f5d20	139	static const struct file_operations transaction_ops = {
1da177e4	140	.write = nfsctl_transaction_write,
7390022d	141	.read = nfsctl_transaction_read,
1da177e4 LT	142	.release = simple_transaction_release,
	143	};
	144
	145	extern struct seq_operations nfs_exports_op;
	146	static int exports_open(struct inode inode, struct file file)
	147	{
	148	return seq_open(file, &nfs_exports_op);
	149	}
	150
4b6f5d20	151	static const struct file_operations exports_operations = {
1da177e4 LT	152	.open = exports_open,
	153	.read = seq_read,
	154	.llseek = seq_lseek,
	155	.release = seq_release,
	156	};
	157
	158	/----------------------------------------------------------------------------/
	159	/*
	160	* payload - write methods
	161	* If the method has a response, the response should be put in buf,
	162	* and the length returned. Otherwise return 0 or and -error.
	163	*/
	164
	165	static ssize_t write_svc(struct file file, char buf, size_t size)
	166	{
	167	struct nfsctl_svc *data;
	168	if (size < sizeof(*data))
	169	return -EINVAL;
	170	data = (struct nfsctl_svc*) buf;
	171	return nfsd_svc(data->svc_port, data->svc_nthreads);
	172	}
	173
	174	static ssize_t write_add(struct file file, char buf, size_t size)
	175	{
	176	struct nfsctl_client *data;
	177	if (size < sizeof(*data))
	178	return -EINVAL;
	179	data = (struct nfsctl_client *)buf;
	180	return exp_addclient(data);
	181	}
	182
	183	static ssize_t write_del(struct file file, char buf, size_t size)
	184	{
	185	struct nfsctl_client *data;
	186	if (size < sizeof(*data))
	187	return -EINVAL;
	188	data = (struct nfsctl_client *)buf;
	189	return exp_delclient(data);
	190	}
	191
	192	static ssize_t write_export(struct file file, char buf, size_t size)
	193	{
	194	struct nfsctl_export *data;
	195	if (size < sizeof(*data))
	196	return -EINVAL;
	197	data = (struct nfsctl_export*)buf;
	198	return exp_export(data);
	199	}
	200
	201	static ssize_t write_unexport(struct file file, char buf, size_t size)
	202	{
	203	struct nfsctl_export *data;
	204
	205	if (size < sizeof(*data))
	206	return -EINVAL;
	207	data = (struct nfsctl_export*)buf;
	208	return exp_unexport(data);
	209	}
	210
	211	static ssize_t write_getfs(struct file file, char buf, size_t size)
	212	{
	213	struct nfsctl_fsparm *data;
	214	struct sockaddr_in *sin;
	215	struct auth_domain *clp;
216	int err = 0;
217	struct knfsd_fh *res;
218
219	if (size < sizeof(*data))
220	return -EINVAL;
221	data = (struct nfsctl_fsparm*)buf;
222	err = -EPROTONOSUPPORT;
223	if (data->gd_addr.sa_family != AF_INET)
224	goto out;
225	sin = (struct sockaddr_in *)&data->gd_addr;
226	if (data->gd_maxlen > NFS3_FHSIZE)
227	data->gd_maxlen = NFS3_FHSIZE;
228
229	res = (struct knfsd_fh*)buf;
230
231	exp_readlock();
232	if (!(clp = auth_unix_lookup(sin->sin_addr)))
233	err = -EPERM;
234	else {
235	err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
236	auth_domain_put(clp);
237	}
238	exp_readunlock();
239	if (err == 0)
240	err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
241	out:
242	return err;
243	}
244
245	static ssize_t write_getfd(struct file file, char buf, size_t size)
246	{
247	struct nfsctl_fdparm *data;
248	struct sockaddr_in *sin;
249	struct auth_domain *clp;
250	int err = 0;
251	struct knfsd_fh fh;
252	char *res;
253
254	if (size < sizeof(*data))
255	return -EINVAL;
256	data = (struct nfsctl_fdparm*)buf;
257	err = -EPROTONOSUPPORT;
258	if (data->gd_addr.sa_family != AF_INET)
259	goto out;
260	err = -EINVAL;
261	if (data->gd_version < 2 \|\| data->gd_version > NFSSVC_MAXVERS)
262	goto out;
263
264	res = buf;
265	sin = (struct sockaddr_in *)&data->gd_addr;
266	exp_readlock();
267	if (!(clp = auth_unix_lookup(sin->sin_addr)))
268	err = -EPERM;
269	else {
270	err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
271	auth_domain_put(clp);
272	}
273	exp_readunlock();
274
275	if (err == 0) {
276	memset(res,0, NFS_FHSIZE);
277	memcpy(res, &fh.fh_base, fh.fh_size);
278	err = NFS_FHSIZE;
279	}
280	out:
281	return err;
282	}
283
284	static ssize_t write_filehandle(struct file file, char buf, size_t size)
285	{
286	/* request is:
287	* domain path maxsize
288	* response is
289	* filehandle
290	*
291	* qword quoting is used, so filehandle will be \x....
292	*/
293	char dname, path;
294	int maxsize;
295	char *mesg = buf;
296	int len;
297	struct auth_domain *dom;
298	struct knfsd_fh fh;
299
300	if (buf[size-1] != '\n')
301	return -EINVAL;
302	buf[size-1] = 0;
303
304	dname = mesg;
305	len = qword_get(&mesg, dname, size);
306	if (len <= 0) return -EINVAL;
307
308	path = dname+len+1;
309	len = qword_get(&mesg, path, size);
310	if (len <= 0) return -EINVAL;
311
312	len = get_int(&mesg, &maxsize);
313	if (len)
314	return len;
315
316	if (maxsize < NFS_FHSIZE)
317	return -EINVAL;
318	if (maxsize > NFS3_FHSIZE)
319	maxsize = NFS3_FHSIZE;
320
321	if (qword_get(&mesg, mesg, size)>0)
322	return -EINVAL;
323
324	/* we have all the words, they are in buf.. */
325	dom = unix_domain_find(dname);
326	if (!dom)
327	return -ENOMEM;
328
329	len = exp_rootfh(dom, path, &fh, maxsize);
330	auth_domain_put(dom);
331	if (len)
332	return len;
333
334	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
335	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
336	mesg[-1] = '\n';
337	return mesg - buf;
338	}
339
340	extern int nfsd_nrthreads(void);
341
342	static ssize_t write_threads(struct file file, char buf, size_t size)
343	{
344	/* if size > 0, look for a number of threads and call nfsd_svc
345	* then write out number of threads as reply
346	*/
347	char *mesg = buf;
348	int rv;
349	if (size > 0) {
350	int newthreads;
351	rv = get_int(&mesg, &newthreads);
352	if (rv)
353	return rv;
354	if (newthreads <0)
355	return -EINVAL;
356	rv = nfsd_svc(2049, newthreads);
357	if (rv)
358	return rv;
359	}
360	sprintf(buf, "%d\n", nfsd_nrthreads());
361	return strlen(buf);
362	}
363
70c3b76c N	364	static ssize_t write_versions(struct file file, char buf, size_t size)
	365	{
	366	/*
	367	* Format:
	368	* [-/+]vers [-/+]vers ...
	369	*/
	370	char *mesg = buf;
	371	char *vers, sign;
	372	int len, num;
	373	ssize_t tlen = 0;
	374	char *sep;
	375
	376	if (size>0) {
	377	if (nfsd_serv)
6658d3a7 N	378	/* Cannot change versions without updating
	379	* nfsd_serv->sv_xdrsize, and reallocing
	380	* rq_argp and rq_resp
	381	*/
70c3b76c N	382	return -EBUSY;
	383	if (buf[size-1] != '\n')
	384	return -EINVAL;
	385	buf[size-1] = 0;
	386
	387	vers = mesg;
	388	len = qword_get(&mesg, vers, size);
	389	if (len <= 0) return -EINVAL;
	390	do {
	391	sign = *vers;
	392	if (sign == '+' \|\| sign == '-')
	393	num = simple_strtol((vers+1), NULL, 0);
	394	else
	395	num = simple_strtol(vers, NULL, 0);
	396	switch(num) {
	397	case 2:
	398	case 3:
	399	case 4:
6658d3a7	400	nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
70c3b76c N	401	break;
	402	default:
	403	return -EINVAL;
	404	}
	405	vers += len + 1;
	406	tlen += len;
	407	} while ((len = qword_get(&mesg, vers, size)) > 0);
	408	/* If all get turned off, turn them back on, as
	409	* having no versions is BAD
	410	*/
6658d3a7	411	nfsd_reset_versions();
70c3b76c N	412	}
	413	/* Now write current state into reply buffer */
	414	len = 0;
	415	sep = "";
	416	for (num=2 ; num <= 4 ; num++)
6658d3a7	417	if (nfsd_vers(num, NFSD_AVAIL)) {
70c3b76c	418	len += sprintf(buf+len, "%s%c%d", sep,
6658d3a7	419	nfsd_vers(num, NFSD_TEST)?'+':'-',
70c3b76c N	420	num);
	421	sep = " ";
	422	}
	423	len += sprintf(buf+len, "\n");
	424	return len;
	425	}
	426
80212d59 N	427	static ssize_t write_ports(struct file file, char buf, size_t size)
	428	{
	429	/* for now, ignore what was written and just
	430	* return known ports
	431	* AF proto address port
	432	*/
	433	int len = 0;
	434	lock_kernel();
	435	if (nfsd_serv)
	436	len = svc_sock_names(buf, nfsd_serv);
	437	unlock_kernel();
	438	return len;
	439	}
	440
70c3b76c	441	#ifdef CONFIG_NFSD_V4
1da177e4 LT	442	extern time_t nfs4_leasetime(void);
	443
	444	static ssize_t write_leasetime(struct file file, char buf, size_t size)
	445	{
	446	/* if size > 10 seconds, call
	447	* nfs4_reset_lease() then write out the new lease (seconds) as reply
	448	*/
	449	char *mesg = buf;
	450	int rv;
	451
	452	if (size > 0) {
	453	int lease;
	454	rv = get_int(&mesg, &lease);
	455	if (rv)
	456	return rv;
	457	if (lease < 10 \|\| lease > 3600)
	458	return -EINVAL;
	459	nfs4_reset_lease(lease);
	460	}
	461	sprintf(buf, "%ld\n", nfs4_lease_time());
	462	return strlen(buf);
	463	}
	464
0964a3d3 N	465	static ssize_t write_recoverydir(struct file file, char buf, size_t size)
	466	{
	467	char *mesg = buf;
	468	char *recdir;
	469	int len, status;
	470
	471	if (size > PATH_MAX \|\| buf[size-1] != '\n')
	472	return -EINVAL;
	473	buf[size-1] = 0;
	474
	475	recdir = mesg;
	476	len = qword_get(&mesg, recdir, size);
	477	if (len <= 0)
	478	return -EINVAL;
	479
	480	status = nfs4_reset_recoverydir(recdir);
	481	return strlen(buf);
	482	}
70c3b76c	483	#endif
0964a3d3	484
1da177e4 LT	485	/----------------------------------------------------------------------------/
	486	/*
	487	* populating the filesystem.
	488	*/
	489
	490	static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
	491	{
	492	static struct tree_descr nfsd_files[] = {
	493	[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
	494	[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
	495	[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
	496	[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
	497	[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
	498	[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR\|S_IRUSR},
	499	[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR\|S_IRUSR},
	500	[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
	501	[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR\|S_IRUSR},
	502	[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR\|S_IRUSR},
70c3b76c	503	[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR\|S_IRUSR},
80212d59	504	[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR\|S_IRUGO},
1da177e4 LT	505	#ifdef CONFIG_NFSD_V4
1da177e4 LT	506	[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR\|S_IRUSR},
0964a3d3	507	[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR\|S_IRUSR},
1da177e4 LT	508	#endif
	509	/* last one */ {""}
	510	};
	511	return simple_fill_super(sb, 0x6e667364, nfsd_files);
	512	}
	513
454e2398 DH	514	static int nfsd_get_sb(struct file_system_type *fs_type,
454e2398 DH	515	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	516	{
454e2398	517	return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1da177e4 LT	518	}
	519
	520	static struct file_system_type nfsd_fs_type = {
	521	.owner = THIS_MODULE,
	522	.name = "nfsd",
	523	.get_sb = nfsd_get_sb,
	524	.kill_sb = kill_litter_super,
	525	};
	526
	527	static int __init init_nfsd(void)
	528	{
	529	int retval;
	530	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
	531
	532	nfsd_stat_init(); /* Statistics */
	533	nfsd_cache_init(); /* RPC reply cache */
	534	nfsd_export_init(); /* Exports table */
	535	nfsd_lockd_init(); /* lockd->nfsd callbacks */
ac4d8ff2	536	nfs4_state_init(); /* NFSv4 locking state */
1da177e4	537	nfsd_idmap_init(); /* Name to ID mapping */
1da177e4 LT	538	if (proc_mkdir("fs/nfs", NULL)) {
	539	struct proc_dir_entry *entry;
	540	entry = create_proc_entry("fs/nfs/exports", 0, NULL);
	541	if (entry)
	542	entry->proc_fops = &exports_operations;
	543	}
	544	retval = register_filesystem(&nfsd_fs_type);
	545	if (retval) {
	546	nfsd_export_shutdown();
	547	nfsd_cache_shutdown();
	548	remove_proc_entry("fs/nfs/exports", NULL);
	549	remove_proc_entry("fs/nfs", NULL);
	550	nfsd_stat_shutdown();
	551	nfsd_lockd_shutdown();
	552	}
	553	return retval;
	554	}
	555
	556	static void __exit exit_nfsd(void)
	557	{
	558	nfsd_export_shutdown();
	559	nfsd_cache_shutdown();
	560	remove_proc_entry("fs/nfs/exports", NULL);
	561	remove_proc_entry("fs/nfs", NULL);
	562	nfsd_stat_shutdown();
	563	nfsd_lockd_shutdown();
1da177e4	564	nfsd_idmap_shutdown();
1da177e4 LT	565	unregister_filesystem(&nfsd_fs_type);
	566	}
	567
	568	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
	569	MODULE_LICENSE("GPL");
	570	module_init(init_nfsd)
	571	module_exit(exit_nfsd)